先化简,再求值:5x²-[2xy-3(1/3xy+2)+4x²]求过程和答案,
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先化简,再求值:5x²-[2xy-3(1/3xy+2)+4x²]求过程和答案,
先化简,再求值:5x²-[2xy-3(1/3xy+2)+4x²]求过程和答案,
先化简,再求值:5x²-[2xy-3(1/3xy+2)+4x²]求过程和答案,
解原式=5x2-[2xy-xy-6+4x2]
=5x2-xy+6-4x2
=x2-xy+6
5x²-[2xy-3(1/3xy+2)+4x²]
=5x²-[2xy-xy-6+4x²]
=5x²-2xy+xy+6-4x²
=x²-xy+6
把x,y的值代入求值。
x²-xy+6